Valve stem seals

High-pressure valve stem seals

Improve the quality of emissions and enhance engine operation by withstanding high pressures in the exhaust and intake ports of the engine, while maintaining their primary function as an oil-metering device.

Available applications

All engines with high pressures in the manifolds, e.g. because of high power turbo chargers or for exhaust brakes on commercial engines. SKF offers new designs of high-pressure valve stem seals, providing minimized guide wear and cost savings in the engine blow-by management:

Reduced blow-by gas volume as the seals do not allow air flow to the top of the cylinder head

Capacity of oil separation in blow-by gases can thus be reduced

Hence cost savings in the blow-by oil separation system

The seal design can be tuned to provide the optimum oil-metering rate for the application and can be supplied with or without an integrated spring seat. Other design characteristics of the pressure valve stem seal allow for dynamic sealing abilities:

Patented independent pressure lip allows the main lip to function under high pressures for consistent oil metering

Reduced risk of valve stem scuffing and guide wear as oil is not “blown” away from valve stem under pressure

Special static seating design avoids popping-off under pressure – a groove is required in the valve guide

No blow-by gas leakage through seal

Through extensive experience, SKF has become the European market leader, creating the most effective product with the following advantages: